I’ve been stuck on a layout bug that’s honestly driving me a bit crazy. It’s not a beginner issue—more of one of those edge cases that shouldn’t be happening but somehow is.
Here’s the setup:
I’m using a CSS Grid layout as the main structure, and inside one of the grid items, there’s a flex container. Everything is pretty standard, but what’s strange is:
- In Chrome, a flex item inside the grid cell is overflowing its container slightly, even though
overflow: hiddenis explicitly set on the parent. - In Firefox, the same layout behaves perfectly—no overflow, no scrollbars, clean as expected.
- I’ve also noticed the browser defaulting to
min-width: autoin places I wouldn’t expect, which seems to mess with alignment and sizing even when I setwidth: 100%manually.
I’ve stripped it down, checked for padding/margin issues, reset box-sizing, and even tested with a clean HTML/CSS structure—same behavior. No JS involved, just pure CSS.
At this point, I’m wondering if this is a rendering inconsistency between browsers or if there’s something subtle I’m overlooking. Has anyone else run into something like this with Flexbox inside Grid layouts?
Happy to share a code snippet if it helps, but I figured I’d check if this rings any bells before I dive into making a reduced test case.